The term 'very low number' can be represented by the crossword solutions ONE, which is a three-letter word. The term 'very low number' implies a small quantity or amount, usually less than ten. It could refer to a single digit, such as ONE, two, three, four, five, six, seven, eight, nine, or zero. It could also refer to a fraction, such as ONE-half, ONE-third, ONE-fourth, ONE-fifth, ONE-sixth, ONE-seventh, ONE-eighth, ONE-ninth, or ONE-tenth. In either case, the number is very small.